How Light Changes Pictures

Broad Question

How does light change photo development?

Specific Question

How can light change chemicals in photography?

Hypothesis

The more light that there is the better the photo will come out.

Variables

Independent Variable:

Light

Dependent Variable:

Silhouette

Variables That Need To Be Controlled:

Silver Polish, Coffee Filter, Coin, Iodine

Vocabulary List That Needs Explanation

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Experimental Design

I will conduct my experiment in the kitchen of my house. I will be the only one working on it and I will be doing all of the experiment. I will need to do five trails of the three lights. As I do my experiment I will be recording my data on a spreadsheet. I will take pictures and record my data on a spreadsheet then put everything on the computer.

Materials List

Sliver Polish
Light
Coffee Filter
Coin
Iodine

Detailed Procedure

1. Moisten cloth and use a small amount of silver polish to rub the tarnish off the piece of silver.
2. In a dark room, put the cloth into a glass and pour just enough bleach into it to cover the cloth. Stir until the black tarnish is off the cloth and in to liquid to make it a dark gray color.
3. Place am open cone filter into the funnel. Put the end of the funnel into an empty glass and pour the silver chloride into the paper cone. After the liquid has stopped dripping unfold the paper cone. Cover the paper with clear plastic wrap. This is the film.
4. Uncover a part of the film, put a coin on it, and place it in direct sunlight. After about twenty minutes, lift the coin and look for the silhouette.
5. Repeat steps 1-3 with different amounts of light. (No light, Medium light, Bright light.)

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Background Research

In commercial processing, the film is removed automatically or by an operator handling the film in a light proof bag from which it is fed into the processing machine. The processing machinery is generally run on a continuous basis with films spliced together in a continuous line.
Early photography in the form of daguerreotypes did not use film at all. The light-sensitive chemicals were formed on the surface of a silver-plated copper sheet. Beginning in the 1850s, thin glass plates coated with photographic emulsion became the standard medium. Although fragile and heavy, the glass used for photographic plates was of better optical quality than early transparent plastics, and in early years it was also less expensive, so the use of such plates persisted long after the introduction of film. Photography is the result of combining several technical discoveries. Long before the first photographs were made, Chinese philosopher Mo Di and Greek mathematicians Aristotle and Euclid described a pinhole camera in the 5th and 4th centuries BC.

References

Photographic processing - Wikipedia, the free encyclopedia." Wikipedia, the free encyclopedia. N.p., n.d. Web. 23 Jan. 2012. <http://en.wikipedia.org/wiki/Photographic_processing>

Photographic processing - Wikipedia, the free encyclopedia." Wikipedia, the free encyclopedia. N.p., n.d. Web. 23 Jan. 2012. <http://en.wikipedia.org/wiki/Photographic_processing>.

Photographic processing - Wikipedia, the free encyclopedia." Wikipedia, the free encyclopedia. N.p., n.d. Web. 23 Jan. 2012. <http://en.wikipedia.org/wiki/Photographic_processing>.

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Results

Data Table

Trial	No Light	Medium Light	Bright Light
1	0	2	5
2	0	1	4
3	0	2	5
4	1	1	4
5	0	1	3

Graph

Photos

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Data Analysis

Conclusion

The original purpose of this experiment was to see what degree of light develops photos the best. The results of the experiment were that bright light makes the silhouette come out much clearer than no light or medium light.

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Discussion

My hypothesis was the more light that there is the better the photo will come out. My results do support my hypothesis. There is a relationship between the independent and dependent variables. Some patterns that trends that my data shows are that the better the light is the clearer the image comes out. I think the tests I did went smoothly. There were no problems with my experiment. Everything went just as
planned. If i could improve my experiment, I would have done more trials to get more accurate data. An interesting future study might involve the same amount of light but with different amounts of time under the light.